Roller grinding-mill



(No Model.) H. BVIRKHOLZ. 2 Sheets-Sheet I'.

v ROLLER GRINDING MILL. No. 269,623. Patented Deo. 26, 1882.

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(No Model.) El BIRKHOLZI 2 sheets-sheet 2.

ROLLER @BINDING MILL.

No. 269,623. Patented Dec. 26, 1882.

w57@ ses s Unirse STATES "artnr trice,

i HANS BIRKHOLZ, OF RACINE, WISCONSIN.

ROLLER GRINDING=IV|ILL.. Y

SPECIFICATION forming' part of Letters Patent No. 269,623, datedDecember 26, 1982. i Y Application filed May 3, 1882. (No model.)

To all whom it muy concern Be it known that I, HANS BIRKHOLZ, formerly asubject ot' the Emperor' of Germany, having tiled a declaration ofintention to become a cltizen of the United States, residing at Racine,in the county ot' Racine and State ot' Wisconsin, have invented certainnew and useful Improvements in Roller Grinding-Mills; and I do herebydeclare the following to be a full, clear, and exact description oftheinvention, such as will enable others skilled in the art to which itappertains to makeand use the same.

.Lnis invention relates to roller grin-dingmills in general, though somefeatures thereof were designed more especially with a view of improvingportable roller grinding-mills in which the grinding-rollers are somounted that one gravitates, and, in operation, has a tendency to crowdtoward the other-a mill, for

instance, such as described in United States Letters Patent No. 255,715.

The object of my improvement is to combfne the spring` which regulatesthe pressure ofthe movable roller toward the ixed roller with the rodfor gaging the space between the rollers in such a manner that thegage-rod may be adjusted without affecting the tension of the spring,and that, on the other hand, the tension ofthe spring may be changedwithout disturbing the adjustment ofthe gage-rod.

In order that my invention may be clearly understood, I have illustratedin the annexed drawings, and will proceed to describe, the best formthereof when applied to a portable roller grinding-mill oftheabove-stated character at present known to me.

Figure l is a partly-sectionized side elevation of such rollergrinding-mill embodying my improvements. Fig. 2 is a partly-sectionizedfront elevation ofthe same, the gage-rod being omitted, as well as thehand-lever for ad.

on the cheek-plates c c, formed on the upper end of the column orstandard (i of the mill. The movable roller l) is journaled in similarjournal-boxes fitted in hollow bosses or guides on the divided casing E,which is pivoted or hinged on a bolt, c, between the cheek-plates of thestandard C, so that the rollers will be entirely inclosed in suchcasing. The holesin the sides of the casing through which thejournals ofroller A pass must be somewhat elongated in the direction ofthe swingofthe casing, so that the lat ter may swing to a limited eX- 'tentwithoutbeingobstructed by such journals.

The movable roller is prevented from running in immediate contact withthe fixed roller, and the normal space between the rollers is determinedby the gage-rod F, which engages a circular nut., F', fitted in acircular recess or hole in standard C, and passes through the lower endofthe casing, being provided with a collar,f, for limiting the approachof the cas ing to the standard. The nut F is capable of turning orswiveling in its seat in the standard, so. as to be able to accommodateitself to changes in the position ofthe gage-rod,due to the movement ofthe casing and its roller. The holes in the standard and the adjacentrear side of the casing through which the gage-rod passes are verticallyelongated to provide for free motion of the movable parts.

At the front side of the casing the gage-rod passes through a box, C2,formed thereon, and is encircled by a. stout spiral spring, Gr, bearingwith one end against 'the bottom of said box and with the other endagainst a cap, Gr", slipped on the gage-rod, and pro vided with lugs gg', which enter longitudinal grooves g g in the shell of the box, sothat the cap but cannot turn in the box.

In order that the gage-rod may be turned in its nut F to gage the spacebetween the rollers, it is provided with a crossbar or handlever, H,fitted on'it next to the' cap G', the

may slide i gage-rod being in this instance attenedon one side, to soengage the correspondinglyformed eye ofthe hand-lever that the lattermayl slide on it. Interlocking recesses and projections are formedrespectively on the adjoining faces of the cap G and hand-lever H, sothat the latter can be turned only on the applica- IOC tion ofconsiderable force to it, or after the cap has been first disconnectedfrom it, according as the interlocking recesses and projections arerounded or square-cornered.

The outer flattened etid of the gage-rod is screw-threaded atid carriesa nut, I, constructed with a hand-wheel for turning it with facility. Byadjusting this iitit I the tension of spring Fr cati be regulatedwitliont changing the adjustment of the gage-rod.

The journal-boxes of the rollers are accurately tted at top and bottomin their guides, but have consider-a1 lateral play therein. Eachjournal-box is provided at the center ot' the side facing the bite ofthe rollers with a shallow recess, in which is seated an elasticcushion, J, of rubber or wood, made long enough to protrude a littlefrom the recess in the box. A set-screw, K, bears on the opposite sideot' the box, being fitted in a screw-threaded hole in the side ot thesupporting-guide otl the box.

\Vhen the box has been properly adj usted the elastic cushion will besomewhat compressed,

bearing with considerable friction against the guide, which, togetherwith the frictioual press uic of the set-screw on the opposite side,will hold the boX so tirnily as to prevent it from moving endwise in itssupporting-guide, allowing it, however, to accommodate itselfl t0 slightinaccuracies of alignment. By proper adjustments of the set-screws K therequired parallelism ofthe rolls may be easily obtained, and lostmot-ion, due to tlte wear of the boxes and journals, may also be readilytaken up.

'Ihe casing E is at the top constructed with a funnel, E, upon which ahopper, L, is to be superimposed. The feed troin the futitiel t0 therollers is governed by a feed-slide, M, as usual. The feed-slide isarranged to slide in guides on one side ot' the funnel. Toits upper endis pivoted a rod, N, which extends from the slide at an acute angle ofabout forty-,five

degrees, more or less, across and through the opposite side of thefutinel, its outerend beingr screw-threaded and entering a nut, N',which is swivelingly connected tothe tunnel, as clearly shown in Fig. 1.This arrangement ofthe feed-slide and its adjusting rod and nutrelatively to one another causes a reciprocal locking of each by theother. so that no jam-nut or other supplementary lockiugdevice isrequired for preventing the shifting ofthe feed-slide by the vibrationsofthe mill.

Iti inills having a stationary casing the gage rod and its adjunctswould be applied to the frame or yoke carrying the movable roller.

I do not herein claini the feed-slide arrange ment shown and described,but reserve the. right to claim it iu a separate patent.

Havingthusdescrihed my invention, what I claim as new isl. Thelcombination, substantially as before set forth, ofthe txedroller-supporting standard, the movable roller-carrying easing pivotedthereto, the adjustable gage-rod, the unt thereof, held by the standard7and the spring connected with said rod and adjustablein tensionindependently thereof.

2. The combination, substantially as before set forth, ofthe fixedroller-supporting standard, the tiiov'able roller-carrying casingpivoted thereto, the adjustable gage-rod, the swiveling iiutthereot',held by the standard, the spring, the sliding cap, the hand-lever forrotating the gage-rod, detachably locked to the sliding cap, and the nutfor adjusting the tension of the spring.

In testimony whereof I aflix my signature in presence of two witnesses.

HANS BIH'KHOLZ.

Witnesses:

CHARLES H. Liin, Guo. L. EDDY.

